care-of

Preposition

(mail) For distribution by (the named intermediary).

Could you please send this package to Mr. John Smith, care of the Northwest Shelter?

Usage notes

Care of, usually abbreviated as c/o on envelopes, signifies an intermediary who is responsible for transferring a piece of mail between the postal system and the final addressee. For example, when the addressee has no standard address, is under a corporate mail system, or is being manually forwarded mail sent to a more accessible location. In Australia and New Zealand c/- is often used in place of c/o.